I was probably 4 years old, maybe 5, when I was out shopping with my father. He stopped on the sidewalk to gab with someone he knew, and I wandered off a little ways. I guess I got scared, because I suddenly turned and rushed back and wrapped my arms around my father's legs - or at least I intended to. Something wasn't quite right, as I looked up and saw the other man, not my father. I still remember how mortified I was, and that was at least 65 years ago. Why do we remember the embarrassing moments so well?